#!/usr/bin/env python
# encoding: utf-8
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2016
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].

"""
This module contains a object that represents Tests for Updater, Dispatcher,
WebhookServer and WebhookHandler
"""
import logging
import signal
import sys
from datetime import datetime
from time import sleep

import os
import re
from future.builtins import bytes
from random import randrange

if sys.version_info[0:2] == (2, 6):
    import unittest2 as unittest
else:
    import unittest

try:
    # python2
    from urllib2 import urlopen, Request, HTTPError
except ImportError:
    # python3
    from urllib.request import Request, urlopen
    from urllib.error import HTTPError

sys.path.append('.')

from telegram import Update, Message, TelegramError, User, Chat, Bot
from telegram.ext import *
from telegram.ext.dispatcher import run_async
from telegram.error import Unauthorized, InvalidToken
from tests.base import BaseTest
from threading import Lock, Thread

# Enable logging
root = logging.getLogger()
root.setLevel(logging.INFO)

ch = logging.StreamHandler(sys.stdout)
ch.setLevel(logging.WARN)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s '
                              '- %(message)s')
ch.setFormatter(formatter)
root.addHandler(ch)


class UpdaterTest(BaseTest, unittest.TestCase):
    """
    This object represents Tests for Updater, Dispatcher, WebhookServer and
    WebhookHandler
    """

    def setUp(self):
        self.updater = None
        self.received_message = None
        self.message_count = 0
        self.lock = Lock()

    def _setup_updater(self, *args, **kwargs):
        bot = MockBot(*args, **kwargs)
        self.updater = Updater(workers=2, bot=bot)

    def tearDown(self):
        if self.updater is not None:
            self.updater.stop()

    def reset(self):
        self.message_count = 0
        self.received_message = None

    def telegramHandlerTest(self, bot, update):
        self.received_message = update.message.text
        self.message_count += 1

    def telegramInlineHandlerTest(self, bot, update):
        self.received_message = (update.inline_query,
                                 update.chosen_inline_result)
        self.message_count += 1

    def telegramCallbackHandlerTest(self, bot, update):
        self.received_message = update.callback_query
        self.message_count += 1

    @run_async
    def asyncHandlerTest(self, bot, update):
        sleep(1)
        with self.lock:
            self.received_message = update.message.text
            self.message_count += 1

    def stringHandlerTest(self, bot, update):
        self.received_message = update
        self.message_count += 1

    def regexGroupHandlerTest(self, bot, update, groups, groupdict):
        self.received_message = (groups, groupdict)
        self.message_count += 1

    def additionalArgsTest(self, bot, update, update_queue, args):
        self.received_message = update
        self.message_count += 1
        if args[0] == 'resend':
            update_queue.put('/test5 noresend')
        elif args[0] == 'noresend':
            pass

    @run_async
    def asyncAdditionalHandlerTest(self, bot, update, update_queue=None):
        sleep(1)
        with self.lock:
            if update_queue is not None:
                self.received_message = update.message.text
                self.message_count += 1

    def errorRaisingHandlerTest(self, bot, update):
        raise TelegramError(update)

    def errorHandlerTest(self, bot, update, error):
        self.received_message = error.message
        self.message_count += 1

    def test_addRemoveTelegramMessageHandler(self):
        self._setup_updater('Test')
        d = self.updater.dispatcher
        from telegram.ext import Filters
        handler = MessageHandler([Filters.text], self.telegramHandlerTest)
        d.addHandler(handler)
        self.updater.start_polling(0.01)
        sleep(.1)
        self.assertEqual(self.received_message, 'Test')

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        self.updater.bot.send_messages = 1
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addTelegramMessageHandlerMultipleMessages(self):
        self._setup_updater('Multiple', 100)
        self.updater.dispatcher.addHandler(
            MessageHandler([], self.telegramHandlerTest))
        self.updater.start_polling(0.0)
        sleep(2)
        self.assertEqual(self.received_message, 'Multiple')
        self.assertEqual(self.message_count, 100)

    def test_addRemoveTelegramRegexHandler(self):
        self._setup_updater('Test2')
        d = self.updater.dispatcher
        regobj = re.compile('Te.*')
        handler = RegexHandler(regobj, self.telegramHandlerTest)
        self.updater.dispatcher.addHandler(handler)
        self.updater.start_polling(0.01)
        sleep(.1)
        self.assertEqual(self.received_message, 'Test2')

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        self.updater.bot.send_messages = 1
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveTelegramCommandHandler(self):
        self._setup_updater('/test')
        d = self.updater.dispatcher
        handler = CommandHandler('test', self.telegramHandlerTest)
        self.updater.dispatcher.addHandler(handler)
        self.updater.start_polling(0.01)
        sleep(.1)
        self.assertEqual(self.received_message, '/test')

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        self.updater.bot.send_messages = 1
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveStringRegexHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = StringRegexHandler('Te.*', self.stringHandlerTest)
        d.addHandler(handler)
        queue = self.updater.start_polling(0.01)
        queue.put('Test3')
        sleep(.1)
        self.assertEqual(self.received_message, 'Test3')

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        queue.put('Test3')
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveStringCommandHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = StringCommandHandler('test3', self.stringHandlerTest)
        d.addHandler(handler)

        queue = self.updater.start_polling(0.01)
        queue.put('/test3')
        sleep(.1)
        self.assertEqual(self.received_message, '/test3')

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        queue.put('/test3')
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveErrorHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        d.addErrorHandler(self.errorHandlerTest)
        queue = self.updater.start_polling(0.01)
        error = TelegramError("Unauthorized.")
        queue.put(error)
        sleep(.1)
        self.assertEqual(self.received_message, "Unauthorized.")

        # Remove handler
        d.removeErrorHandler(self.errorHandlerTest)
        self.reset()

        queue.put(error)
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_errorInHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = StringRegexHandler('.*', self.errorRaisingHandlerTest)
        d.addHandler(handler)
        self.updater.dispatcher.addErrorHandler(self.errorHandlerTest)
        queue = self.updater.start_polling(0.01)

        queue.put('Test Error 1')
        sleep(.1)
        self.assertEqual(self.received_message, 'Test Error 1')

    def test_cleanBeforeStart(self):
        self._setup_updater('')
        d = self.updater.dispatcher
        handler = MessageHandler([], self.telegramHandlerTest)
        d.addHandler(handler)
        self.updater.start_polling(0.01, clean=True)
        sleep(.1)
        self.assertEqual(self.message_count, 0)
        self.assertIsNone(self.received_message)

    def test_errorOnGetUpdates(self):
        self._setup_updater('', raise_error=True)
        d = self.updater.dispatcher
        d.addErrorHandler(self.errorHandlerTest)
        self.updater.start_polling(0.01)
        sleep(.1)
        self.assertEqual(self.received_message, "Test Error 2")

    def test_addRemoveTypeHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = TypeHandler(dict, self.stringHandlerTest)
        d.addHandler(handler)
        queue = self.updater.start_polling(0.01)
        payload = {"Test": 42}
        queue.put(payload)
        sleep(.1)
        self.assertEqual(self.received_message, payload)

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        queue.put(payload)
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveInlineQueryHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = InlineQueryHandler(self.telegramInlineHandlerTest)
        handler2 = ChosenInlineResultHandler(self.telegramInlineHandlerTest)
        d.addHandler(handler)
        d.addHandler(handler2)
        queue = self.updater.start_polling(0.01)
        update = Update(update_id=0, inline_query="testquery")
        update2 = Update(update_id=0, chosen_inline_result="testresult")
        queue.put(update)
        sleep(.1)
        self.assertEqual(self.received_message[0], "testquery")

        queue.put(update2)
        sleep(.1)
        self.assertEqual(self.received_message[1], "testresult")

        # Remove handler
        d.removeHandler(handler)
        d.removeHandler(handler2)
        self.reset()

        queue.put(update)
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_addRemoveCallbackQueryHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = CallbackQueryHandler(self.telegramCallbackHandlerTest)
        d.addHandler(handler)
        queue = self.updater.start_polling(0.01)
        update = Update(update_id=0, callback_query="testcallback")
        queue.put(update)
        sleep(.1)
        self.assertEqual(self.received_message, "testcallback")

        # Remove handler
        d.removeHandler(handler)
        self.reset()

        queue.put(update)
        sleep(.1)
        self.assertTrue(None is self.received_message)

    def test_runAsync(self):
        self._setup_updater('Test5', messages=2)
        d = self.updater.dispatcher
        handler = MessageHandler([], self.asyncHandlerTest)
        d.addHandler(handler)
        self.updater.start_polling(0.01)
        sleep(1.2)
        self.assertEqual(self.received_message, 'Test5')
        self.assertEqual(self.message_count, 2)

    def test_additionalArgs(self):
        self._setup_updater('', messages=0)
        handler = StringCommandHandler('test5', self.additionalArgsTest,
                                       pass_update_queue=True, pass_args=True)
        self.updater.dispatcher.addHandler(handler)

        queue = self.updater.start_polling(0.01)
        queue.put('/test5 resend')
        sleep(.1)
        self.assertEqual(self.received_message, '/test5 noresend')
        self.assertEqual(self.message_count, 2)

    def test_regexGroupHandler(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = StringRegexHandler('^(This).*?(?P<testgroup>regex group).*',
                                     self.regexGroupHandlerTest,
                                     pass_groupdict=True, pass_groups=True)
        d.addHandler(handler)
        queue = self.updater.start_polling(0.01)
        queue.put('This is a test message for regex group matching.')
        sleep(.1)
        self.assertEqual(self.received_message, (('This', 'regex group'),
                                                 {'testgroup': 'regex group'}))

    def test_runAsyncWithAdditionalArgs(self):
        self._setup_updater('Test6', messages=2)
        d = self.updater.dispatcher
        handler = MessageHandler([], self.asyncAdditionalHandlerTest,
                                 pass_update_queue=True)
        d.addHandler(handler)
        self.updater.start_polling(0.01)
        sleep(1.2)
        self.assertEqual(self.received_message, 'Test6')
        self.assertEqual(self.message_count, 2)

    def test_webhook(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = MessageHandler([], self.telegramHandlerTest)
        d.addHandler(handler)

        ip = '127.0.0.1'
        port = randrange(1024, 49152)  # Select random port for travis
        self.updater.start_webhook(ip, port,
                                   url_path='TOKEN',
                                   cert='./tests/test_updater.py',
                                   key='./tests/test_updater.py',
                                   webhook_url=None)
        sleep(0.5)
        # SSL-Wrapping will fail, so we start the server without SSL
        Thread(target=self.updater.httpd.serve_forever).start()

        # Now, we send an update to the server via urlopen
        message = Message(1, User(1, "Tester"), datetime.now(),
                          Chat(1, "group", title="Test Group"))

        message.text = "Webhook Test"
        update = Update(1)
        update.message = message

        self._send_webhook_msg(ip, port, update.to_json(), 'TOKEN')

        sleep(1)
        self.assertEqual(self.received_message, 'Webhook Test')

        print("Test other webhook server functionalities...")
        response = self._send_webhook_msg(ip, port, None, 'webookhandler.py')
        self.assertEqual(b'', response.read())
        self.assertEqual(200, response.code)

        response = self._send_webhook_msg(ip, port, None, 'webookhandler.py',
                                          get_method=lambda: 'HEAD')

        self.assertEqual(b'', response.read())
        self.assertEqual(200, response.code)

        # Test multiple shutdown() calls
        self.updater.httpd.shutdown()
        self.updater.httpd.shutdown()
        self.assertTrue(True)

    def test_webhook_no_ssl(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        handler = MessageHandler([], self.telegramHandlerTest)
        d.addHandler(handler)

        ip = '127.0.0.1'
        port = randrange(1024, 49152)  # Select random port for travis
        self.updater.start_webhook(ip, port, webhook_url=None)
        sleep(0.5)

        # Now, we send an update to the server via urlopen
        message = Message(1, User(1, "Tester 2"), datetime.now(),
                          Chat(1, 'group', title="Test Group 2"))

        message.text = "Webhook Test 2"
        update = Update(1)
        update.message = message

        self._send_webhook_msg(ip, port, update.to_json())
        sleep(1)
        self.assertEqual(self.received_message, 'Webhook Test 2')

    def test_start_dispatcher_twice(self):
        self._setup_updater('', messages=0)
        d = self.updater.dispatcher
        self.updater.start_polling(0.1)
        d.start()

    def test_bootstrap_retries_success(self):
        retries = 3
        self._setup_updater('', messages=0, bootstrap_retries=retries)

        self.updater._set_webhook('path', retries, None)
        self.assertEqual(self.updater.bot.bootstrap_attempts, retries)

    def test_bootstrap_retries_unauth(self):
        retries = 3
        self._setup_updater('', messages=0, bootstrap_retries=retries,
                            bootstrap_err=Unauthorized())

        self.assertRaises(Unauthorized, self.updater._set_webhook, 'path',
                          retries, None)
        self.assertEqual(self.updater.bot.bootstrap_attempts, 1)

    def test_bootstrap_retries_invalid_token(self):
        retries = 3
        self._setup_updater('', messages=0, bootstrap_retries=retries,
                            bootstrap_err=InvalidToken())

        self.assertRaises(InvalidToken, self.updater._set_webhook, 'path',
                          retries, None)
        self.assertEqual(self.updater.bot.bootstrap_attempts, 1)

    def test_bootstrap_retries_fail(self):
        retries = 1
        self._setup_updater('', messages=0, bootstrap_retries=retries)

        self.assertRaisesRegexp(TelegramError, 'test',
                                self.updater._set_webhook, 'path', retries - 1,
                                None)
        self.assertEqual(self.updater.bot.bootstrap_attempts, 1)

    def test_webhook_invalid_posts(self):
        self._setup_updater('', messages=0)

        ip = '127.0.0.1'
        port = randrange(1024, 49152)  # select random port for travis
        thr = Thread(target=self.updater._start_webhook,
                     args=(ip, port, '', None, None, 0, None))
        thr.start()

        sleep(0.5)

        try:
            with self.assertRaises(HTTPError) as ctx:
                self._send_webhook_msg(ip, port,
                                       '<root><bla>data</bla></root>',
                                       content_type='application/xml')
            self.assertEqual(ctx.exception.code, 403)

            with self.assertRaises(HTTPError) as ctx:
                self._send_webhook_msg(ip, port, 'dummy-payload',
                                       content_len=-2)
            self.assertEqual(ctx.exception.code, 403)

            # TODO: prevent urllib or the underlying from adding content-length
            # with self.assertRaises(HTTPError) as ctx:
            #     self._send_webhook_msg(ip, port, 'dummy-payload',
            #                            content_len=None)
            # self.assertEqual(ctx.exception.code, 411)

            with self.assertRaises(HTTPError) as ctx:
                self._send_webhook_msg(ip, port, 'dummy-payload',
                                       content_len='not-a-number')
            self.assertEqual(ctx.exception.code, 403)

        finally:
            self.updater._stop_httpd()
            thr.join()

    def _send_webhook_msg(self, ip, port, payload_str, url_path='',
                          content_len=-1, content_type='application/json',
                          get_method=None):
        headers = {
            'content-type': content_type,
        }

        if not payload_str:
            content_len = None
            payload = None
        else:
            payload = bytes(payload_str, encoding='utf-8')

        if content_len == -1:
            content_len = len(payload)

        if content_len is not None:
            headers['content-length'] = str(content_len)

        url = 'http://{ip}:{port}/{path}'.format(ip=ip, port=port,
                                                 path=url_path)

        req = Request(url, data=payload, headers=headers)

        if get_method is not None:
            req.get_method = get_method

        return urlopen(req)

    def signalsender(self):
        sleep(0.5)
        os.kill(os.getpid(), signal.SIGTERM)

    def test_idle(self):
        self._setup_updater('Test6', messages=0)
        self.updater.start_polling(poll_interval=0.01)
        Thread(target=self.signalsender).start()
        self.updater.idle()
        # If we get this far, idle() ran through
        sleep(1)
        self.assertFalse(self.updater.running)

    def test_createBot(self):
        updater = Updater('123:abcd')
        self.assertIsNotNone(updater.bot)

    def test_mutualExclusiveTokenBot(self):
        bot = Bot('123:zyxw')
        self.assertRaises(ValueError, Updater, token='123:abcd', bot=bot)

    def test_noTokenOrBot(self):
        self.assertRaises(ValueError, Updater)


class MockBot(object):
    def __init__(self, text, messages=1, raise_error=False,
                 bootstrap_retries=None, bootstrap_err=TelegramError('test')):
        self.text = text
        self.send_messages = messages
        self.raise_error = raise_error
        self.token = "TOKEN"
        self.bootstrap_retries = bootstrap_retries
        self.bootstrap_attempts = 0
        self.bootstrap_err = bootstrap_err

    @staticmethod
    def mockUpdate(text):
        message = Message(0, None, None, None)
        message.text = text
        update = Update(0)
        update.message = message
        return update

    def setWebhook(self, webhook_url=None, certificate=None):
        if self.bootstrap_retries is None:
            return

        if self.bootstrap_attempts < self.bootstrap_retries:
            self.bootstrap_attempts += 1
            raise self.bootstrap_err

    def getUpdates(self,
                   offset=None,
                   limit=100,
                   timeout=0,
                   network_delay=2.):

        if self.raise_error:
            raise TelegramError('Test Error 2')
        elif self.send_messages >= 2:
            self.send_messages -= 2
            return self.mockUpdate(self.text), self.mockUpdate(self.text)
        elif self.send_messages == 1:
            self.send_messages -= 1
            return self.mockUpdate(self.text),
        else:
            return []


if __name__ == '__main__':
    unittest.main()